﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace Kenly.ChineseSegment.Core
{
    internal static class Utility
    {
        /// <summary>
        /// 
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static bool IsValidFile(string filePath)
        {
            if (string.IsNullOrEmpty(filePath))
            {
                return false;
            }

            if (!System.IO.File.Exists(filePath))
            {
                return false;
            }

            return true;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static bool IsChinese(string text)
        {
            string regExpression = "[\u4e00-\u9fa5]";
            return Regex.IsMatch(text, regExpression);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static bool IsLetter(string text)
        {
            string regExpression = "[a-z|A-Z]";
            return Regex.IsMatch(text, regExpression);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public static bool IsNumber(string text)
        {
            string regExpression = "[0-9]";
            return Regex.IsMatch(text, regExpression);
        }
    }
}
